golangci-lint: replace exportloopref linter with copyloopvar

We were getting an error:

    WARN The linter 'exportloopref' is deprecated (since v1.60.2) due to: Since Go1.22 (loopvar) this linter is no longer relevant. Replaced by copyloopvar.
    ERRO [linters_context] exportloopref: This linter is fully inactivated: it will not produce any reports.

Author: mandre

.golangci.yml

@@ -5,13 +5,13 @@ linters:
   - asciicheck
   - bidichk
   - bodyclose
+  - copyloopvar
   - cyclop
 #  - depguard
   - dogsled
   - dupword
   - durationcheck
   - errcheck
-  - exportloopref
   - forbidigo
   - gci
   - goconst